If One Party's Security Interest Attached in March,but Has Not

Multiple Choice

If one party's security interest attached in March,but has not been perfected,and another creditor's security interest attached and perfected in April,which of the following is true as of the following December?

A) The security interests have equal priority.
B) The security interest that attached in March has priority.
C) The security interest that attached in March has priority,but only if it became perfected prior to the other creditor bringing an action on the collateral.
D) The security interest that was perfected in April has priority.